Malicious PDF — malware analysis report

Static analysis result for SHA-256 9830bb4a8dffff37…

MALICIOUS

PDF

68.7 KB Created: 2021-09-27 14:05:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 324f628bf88d354f82559877a543d9f5 SHA-1: f7b3a21fb4765cc5a59959f41900a3c8f1e3bf97 SHA-256: 9830bb4a8dffff37c5b9987f44b9bea5035565958ad33267b111bc6b66775dc3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. It also features a large number of external links, many of which point to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution campaign. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://conexkarvan.com/cache/fck_files/file/jogexiramujedabelelu.pdf In PDF document text
    • http://buddhavihara.net/userfiles/file/56226978751.pdfIn PDF document text
    • http://scuderia512.com/js/upload/files/votexufesisirotorutipe.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614bb293d58b3---nagebelupag.pdfIn PDF document text
    • https://implantsdentairesdesmoulins.com/upload/editor/file/vevinizoxajifujif.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/91136612069.pdfIn PDF document text
    • http://adasbruiloften.nl/userfiles/file/28509673757.pdfIn PDF document text
    • http://bosch-elektronarzedzia.pl/catalog/file/16506139989.pdfIn PDF document text
    • http://nakamurasangyou.jp/app/webroot/uploads/files/53334861285.pdfIn PDF document text
    • https://sunkamalzemecilik.com/userfiles/file/poforewerariwal.pdfIn PDF document text
    • https://laundrybyconrads.com/nbloom/fckuploads/file/41930610406.pdfIn PDF document text
    • https://interstudy.net/userfiles/file/junaxewo.pdfIn PDF document text
    • http://bangdientunhk.com/upload/files/jugotamodirepanerixivew.pdfIn PDF document text
    • http://conkheror.com/ckfinder/userfiles/files/doriziwoledenufokemixi.pdfIn PDF document text
    • http://algarestofos.pnh.pt/js/ckfinder/userfiles/files/19895796124.pdfIn PDF document text
    • https://lean-ds.com/upload/editor/file/5773557495.pdfIn PDF document text
    • https://aykutemlak.com/upload/ckfinder/files/48910125117.pdfIn PDF document text
    • https://cortopolis.ar/userfiles/file/22811493597.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/530d55fcc6571768ee2dcc2934c1580a/pusuwosutowepalopoga.pdfIn PDF document text
    • http://parateam.cz/file/44170082926.pdfIn PDF document text
    • http://ozona.pt/js/fckeditor/editor/filemanager/connectors/wysiwygfiles/file/tivof.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/16140bc102dbc5---suxevipugin.pdfIn PDF document text
    • https://posetili.ru/userfiles/file/76381423822.pdfIn PDF document text
    • http://salman-is.com/userfiles/file/lulolukugopibave.pdfIn PDF document text
    • http://putzlappenborner.at/editor_up/51144938317.pdfIn PDF document text
    • http://intertravel.hu/_user/file/88766831376.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=cafeland+offline+apkPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b142.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB142 14780 bytes
SHA-256: 6992aacda8792f200be0a8fc653f595d877fb8f83009191051d2f57c5be7245d
font_01_sfnt_off0000d645.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD645 10248 bytes
SHA-256: 62407836ae6bc7a817ddb852c887c39f43fc6aeda9aec5f12afd9fc2fe06e61d
font_02_sfnt_off0000ed55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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